Trimming-machine.



L. L. PFEIFER.

TRIMMING MACHINE.

APPLICATION FILED OCT. 20. I9I6- .Ihm wlu Patented N0vu27, 191?,

2 SHEETS-SHEET I.

IL. -L. PFEIFER'.

TRlMMING MACHINE.

APPLICATION FILED OCT. 20. I916.

2 SHEETS-SHEET z.

Pamntedl Nov. 27

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LEO L. PFEIFER, or COLUMBUS; OHIO, Assrenoa TO THE JOHN w. Baown MANUFAC TUBING COMPANY, 01? collar Inns onto; a ootaroaarion or OHIO.

Specification of Letters Patent.

Patented Nov. 27, 1917?.

Application filed October 20, 1916. Serial No; 126,657;

To all whom it may concern:

Be it known that I, Lno L. Prnrrnn, a citlzen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have inventedcertain new and useful Impr vements in Trimming-Machines, of which the following is a specification.

This invention relates to trimming machines and is particularly directed to" an improved type of structure wherein the housings or casings of automobile lamps or their reflectors may be given a trimming prior to their assemblage. In. other words, the main object of my invention resides in a structure whereby the stamped metal work of the type referred to, or the equivalent, may be trimmed to present a finished edge.

In carrying forth this object, my invention also consists in a peculiar type of cutter structure so arranged that it will travel in a predetermined path and is capable of movement toward or away from the work to efiect the cutting.

The preferred embodiment of my invention is shown in the accompanying sheets of drawings, in which similar characters of reference designate corresponding parts, and

in which Figure 1 is a top plan view of my improved type of lathe,

Fig; 2 is a cross section taken on line'22 of Fig. 1,

Fig. 3 is a section taken on line 3-3 of Fig. 4 is a section taken on line 4l4: of Fig. 3, and,

Fig. 5 is a view in perspective showing a lamp casing prior to the trimming operation eflected by my machine. 7

In these drawings, the bed frame is designated generally by the reference numeral 1 and is shown as carrying a head stock 2 and a tail stock 3. The tail stock is slidable back and forth 011 the guideways 4: formed on the bed frame in the usual manner, and is further provided with a centering pin support 5 which is movable back and forth in the tail stock by means of the threaded shaft 6 and handle 7.

Power is delivered to the machine by means of a belt passing over the pulleys 8, which latter are rigidly mounted in connection with the sleeve 9 rotatably mounted upon the head shaft 10. The spur gear shown at 11 is also rigidly connected with the sleeve 9and is designed to mesh with the pinion 12 keyed to the counter shaft 13. A spur gear- 1a is also keyed to the counter shaft- 18 and this latter meshes with the spur pinion 15 rigidly carried by the shaft 10. In this manner the head shaft 10 rotates at a comparatively high rate of speed. The forward end of the shaft 10 carries a mandrel 16 which mandrel is preferably of a shape to snugly fit the inside of the work operated upon, in the present instance it being shaped to fit the interior of a lamp casing 17 such as is shown in perspective in Fig. 5. This mandrel is further provided with a peripheral groove 18 designed to form a trackway for the roller 19 which forms a portion of the cutter structure. To this roller 19 there is rigidly connected a cutter blade 20 and an inspection of Fig. 4, will show that this roller 19 is of a somewhat larger diameter than the diameter of the cutter. Both are rotatably journaled in the upper. end of a link member 21, this link being pivotally mounted at its lower end, as shown at 22, to the bed frame and is nor mally urged away from the mandrel by means of the leaf spring shown at 23. The roller 19 is designed to enter the peripheral groove 18 which thereby forms a guideway to correctly space the cutter blade 19 with respect to the offset portion of the mandrel shown at 24:. It is desirable to have this off set portion in order to avoid jagged or burred edges in the completed article.

The operation of the structure thus far described is as follows: The lamp casing after it is stamped, usu ally has an unfinished edge such as is shown at 25, and it is this edge which it is desired to trim. The casing is then placed upon the mandrel and rigidly held in position thereon by moving the bearing member 26 fastened in the center pin support of the tail stock into engagement therewith. This bearing member is usually made of wood or some similar material, which will prevent scarring of the product. This clamps the reflector in position and the cutter blade is then moved toward the work so that the roller 19 enters the guide groove 18 to properly locate the cutter blade 20 with respect to the offset portion 2 1. Inasmuch as the mandrel rotates at some considerable speed, contact of the cutter blade with the reflector will cause this cutter to correspondingly rotate and s flici n n a pressure will sever the excess material to. leave a clean edge as is desired.

In order to conveniently move the cutter Structure as has been outlined, I have provided the bed frame with an upstanding ear 27 to which the lever 28 is pivotally connected as is shown at 29. The front end of this lever is provided with a cam portion shown at 30 of such shape that when the lever is pulled down, the cam portion engages the link 21 to cause the cutter structure to move toward the mandrel. A spring 31 is also provided to automatically lift the lever upon release and by means of the spring shown at 23, the cutter structure is then automatically withdrawn as soon as the spring 31 is allowed to function.

What I claim, is:

1. An edge trimming machine of the character described comprising a head stock, a mandrel carried thereby provided with a guide groove, and an offset groove spaced from each other a distance so that the unfinished edge of the work lies between them, means for holding the work in connection with said mandrel, means whereby said mandrel may be rotated, and a cutter structure formed of a cutting blade and a guide mem ber spaced from each other a distance equal ing the spacing of said two grooves on said mandrel, said guide member being arranged to engage its guide groove before said cutting blade engages the work.

2. An edge trimming machine of the character described comprising a head stock, a mandrel carried thereby provided with a guide groove and an offset groove spaced from each other a distance so that the unfinished edge of the work lies between them,

means for holding the work in connection with said mandrel, means whereby said mandrel may be rotated, a rotary cutter structure formed of a circular cutting knife and guide roller larger in diameter than said knife, said knife and said roller'being spaced from each other a distance equaling the spacing of the two grooves on said mandrel, and means for forcing said cutter structure toward and away from the work.

3. An edge trimming machine of the character described comprising a head stock, a mandrel carried thereby provided with a guide groove and an oflset groove spaced from each other a distance so that the unfinished edge of the work lies between them, means for holding the work in connection with said mandrel, means whereby said mandrel may be rotated, a rotary cutter structure formed of a circular cutting knife and guide roller larger in diameter than said knife, said knife and said roller being spaced from each other a distance equaling the spacing of the two grooves on said mandrel, an upstanding link pivotally mounted at its lower end to the machine frame, said cutter structure being rotatably mounted in the up per end of said link, a lever pivotally mounted on the machine frame, and a cam formation on the end of said lever arranged to engage said link to force said cutter structure toward the work.

In testimony whereof I afiix my signature in presence of two witnesses.

WALTER L. BOOK, A. L. PHELPS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

